Video - Birds M135i Complete Conversion vs BMW M2 - Autocar Magazine
Autocar and Birds have collaborated over the past 6 months on a project car, a BMW F21 M135i, by upgrading many different aspects of the model which are all included in the Birds B1 Complete Conversion package.
The contents of the Birds B1 Complete Conversion:
- The Quaife ATB limited slip differential
- Birds own B-Series Sport Suspension kit
- Engine management software upgrade (390ps at 5700rpm and 520Nm at 3,200rpm)
- Short gearshift
- Clutch pedal weight modification